(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

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Disclosed is a method for combining a plurality of simulationmodels of a given hard core, where each model provides somesubset of the overall functionality of the core, and a statemachine is used to determine which of the implementations willdrive the output pins based on the mode of operation.

Above is a diagram of a sample implementation, combining agate-level and a behavioral simulation model of a core. A toplevel module is created which instantiates both implementationsof the core. The inputs to both core models are driven from theinputs to the top level module. The outputs of the two modulesfeed multiplexers for which the mux select is driven from a modeselector module. The mode selector module monitors the top levelmodule inputs and determines which of the implementation'soutputs are appropriate given the current mode of operation.

This structure could be extended to an arbitrary number of coreimplementations. Additionally, different output pins could bedriven from different implementations at the same time.